Packing material.



R.y H. ANDERBERG.

PACKING MATERIAL.

APPLIUATION FILED JULY 31, 1911.

Patented Feb. 24, 1914.

RALPH Hr ANDERBERG, ,0F CHELSEA, MASSACHUSETTS.

PACKINQMATEBIAL."

Speccatiexi of iett'er's' Patent. Patented Feb. 24, 1914.

Application inea .my a1, i911." serial No. 641,533.

To all 'whom t may concern:-

Bev it known that I ,RA'EPH I-I. ANDERBERG, a citizen of the United States, and-'resident of Chelsea, in the county 'of Suiolkland State of Massachusetts,-zhave invented cer.'-

tain new and useful Improvements inPack#` ing Material, of which the following is a specification.

This invention has for its object to provide certain improvements in packing'material of the general character of that set forth in Letters Patent of the United States No. 967,392, dated August 16, 1910.

On the drawing, Figure, 1 represents a piece or section ofthe packing embodying,

the present improvements. sbme of the material detached.

According to my invention, I employ a mass of disconnected independent blocks or piecesa of resilient material. This material consists preferably of "alternate layers' of duck or other textile material and rubber vulcanized together, although I may utilize any equivalent material which is compressible and more or less resilient. I found that, by cutting these pieces in irre of substantially' prismatic s ape, they tit more closely together and are more adapted to slide relatively to each other when ycompressed in the stuffing box than where they are oblong, as in Patent No. 967,392 previ- Fig. 2 shows ously referred to. These blockspor pieces are'heavily coated with a lubricant such as oil and powdered or flake'd graphite so that eachl iece has adherent toit an carries with-1t a relativel, large amount of the graphite. Some di culty is' experienced in inserting these materials incertain stuiing boxes as where the material'must be inserted fromb'elow cri'wherejthe vb ox is comparatively inaccessible, and 'I' have therefore devised a holde'1- ior thepacking material lby which it may be handled conveniently and introduced easily into 1 the box or gland. This holder consists cf a loosely braided tube b ofiiberl such.- as cettomjute or the like, the-thread-s.-bein'g' separatedso as to provide comparatively... large apertures c through which the v4-I'iacki-nglmaterial may lar form but impinge upon the moving part such as a lpiston rod which passes through the stuffing The packing material is forcedinto the braided Atu be,.'as shown' in Fig. 1, and the tube ismade in indeterminate lengths if deslred, or in regular lengths,`and the ends of the tubes are closed, b tying each end'with a string to prevent t e dislocation of the packing material. By reason of the loose braiding of the tube, the graphite and lubricant,.with which the blocks or pieces of the packing are thickly coated, immediately come in contactwith the moving element and thoroughly lubricate it,' the tube soon Wearing out by the vfriction-.01:` the element. The compression of the cap of the stuilin box against the packing material ten s to squeeze out thel graphite frontiy between the 1. A packing material comprising a plu-y rality of independent blocks of-resilient material, each coated with graphite, and forming. -a compressible mass with relatively movable elements, and a destructible or temporary open-mesh tubular flexible holder or coveringhaving 4larg'e1aI')er tures. for .the exposure of the graphite and itsemission when under compression--- 2.; A packirigmaterialconsisting of a de- -structible openlmesl--loflder and a loose mass of` .relatively,nvabla' substantially prismatic -blocks 'or pieces of `resilient material, each 'block or graphite.

In testimony whereof I have affixed my signature, in presence of two witnesses.

Witnesses:

MARCUS B. MAY, PW. Plizz'nrin RALPH H. yANDERBERGf.

'9'0 i piece being coated with 

